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Finding the Fourth Proportional to 128,297.78, 177,043.79 and 70,933.78

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Solution

The fourth proportional to 128,297.78, 177,043.79 and 70,933.78 is: 97,884.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,297.78 : 177,043.79 = 70,933.78 : x
  2. Step 2: Convert to fraction form
    128,297.78/177,043.79 = 70,933.78/x
  3. Step 3: Cross multiply
    128,297.78x = 177,043.79 × 70,933.78
  4. Step 4: Simplify right side
    128,297.78x = 12,558,385,648.87
  5. Step 5: Solve for x
    x = 12,558,385,648.87/128,297.78
  6. Step 6: Final answer
    x = 97,884.67

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.